| Rank | Country | Suffrage |
105 | Iceland | 18 years of age; universal |
106 | India | 18 years of age; universal |
| Indian Ocean | void |
219 | Indonesia | 17 years of age; universal and married persons regardless of age |
107 | Iran | 18 years of age; universal |
108 | Iraq | 18 years of age; universal |
109 | Ireland | 18 years of age; universal |
228 | Isle of Man | 16 years of age; universal |
110 | Israel | 18 years of age; universal |
111 | Italy | 18 years of age; universal (except in senatorial elections, where minimum age is 25) |
112 | Jamaica | 18 years of age; universal |
| Jan Mayen | void |
17 | Japan | 20 years of age; universal |
229 | Jersey | 16 years of age; universal |
113 | Jordan | 18 years of age; universal |
114 | Kazakhstan | 18 years of age; universal |
115 | Kenya | 18 years of age; universal |
116 | Kiribati | 18 years of age; universal |
220 | Korea, North | 17 years of age; universal |
20 | Korea, South | 19 years of age; universal |
117 | Kosovo | 18 years of age; universal |
4 | Kuwait | 21 years of age; universal; note - males in the military or police are not allowed to vote; adult females were allowed to vote as of 16 May 2005; all voters must have been citizens for 20 years |